I always keep all of the inserts, even when they're just advertisements for other crap. There was one time I was trading a bunch of things into Bull Moose, and the employee checking them expressed amazement that all of that stuff was in there, as well as that the discs and packaging were in such...
True enough, but then there's no reason why all of the information about the book can't be presented on the book itself, just as it's done on paperbacks (or on children's hardcover books). It's simply the way that book presentations have evolved over the last couple of centuries.
The way I see...